Deposition of BiOBr thin films by thermal evaporation and evaluation of its photocatalytic activity

López Cuellar, E. y Martínez de la Cruz, A. y Chávez Torres, N. y Olivares Cortez, J. (2015) Deposition of BiOBr thin films by thermal evaporation and evaluation of its photocatalytic activity. Catalysis Today, 252. pp. 2-6. ISSN 09205861

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Resumen

Thin films of BiOBr were prepared by a sequential evaporation process in a thermal evaporation system (TES) starting from BiOBr powders previously synthesized by co-precipitation. The deposition rate was fixed at 1.2A˚ s−1 to get a controlled evaporation of the material using glass slides as substrate. BiOBr thin films with a thickness of 300 nm were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analysis by XRD of the thin film deposited confirmed the formation of BiOBr, showing a high degree of specific crystal orientation in {0 0 1} planes. In the same way, SEM analysis showed that the deposition of oxide took place by formation of plates and small particles with shape of flowers. The photocatalytic activity of BiOBr thin films was evaluated in the degradation reaction ofrhodamine B (RhB) in aqueous solution under sun-like irradiation. BiOBr thin films were able to bleach a solution of RhB (5 mg L−1) in 99% after 24 h, and to mineralize a solution of RhB (50 mg L−1) in 38% after 96 h.

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